Ammonium nitrate fertilizer



."BIRGER FJ'ELD HALVORSEN, OF CHRISTIAN IA,

NORWAY, ASSIGNOR/TO NOR/SK HYDRO- ELEKTRISK KVAELSTOFAKTIESELSKAB, OF CHRISTIANIA, NORWAY.

AMMONIUM NITRLATE FERTILIZER.

No Drawing.

To all whom-it may 0012mm:

Be it known that I, BIRGER FJELD HAL- I voRsEN, a subject of the King of Norway, re-.

siding at Oscars Gate 71, Christiania, Norway, have invented certain new and useful Improvements in Ammonium- Nitrztte Fertilizers; .and I do hereby declare the following to 'be a full, clear, and exact description oxidized in the mould .of the invention, such as will enable others skilled in the art to which it ,appertains to make and use the same.

This invention has for its object an improved ammonium nitrate fertilizer. As known the ammonium nitrate would be a very valuable fertilizer, ifit were not for its property of hardening into lumps-during storage. It has been suggested to counteract this tendency of agglomerating-into I lumps by means of mixing the ammonium nitrate with various substances such as a suspension of morass ore, (bog iron ore), kiese hr and the like, and subjecting the mixt re to. a mechanical treatment. 5 Such a method is described in the Norwegian patent specification N r. 2887 3.

By this method of preparation the product.

is loaded'with small quantities of indifferent substances which it is true do no harm but which involve expenses for their purchase and in the form of increasedfreight costs for-thefinished product.

The present invention is nowbased upon this observation that an improvement in the I physical properties of the ammonium nitrate is eflected by the'agency of phosphates and in accordance with this observation the present invention consists in subjecting a mixture comprising ammonium nitrate and a phosphate to agglomeration. Bythis method the product is not charged with the costs of indifferent admixtures, a mixed fertilizer being obtained. In this mixture the added phosphate acts as a phosphate fertilizer, in that the ammonium nitrate behaves as a so- .called physiologically acid fertilizer. The fact is that ammonia has been foundto be more rapidly to nitric acid than it is taken up by the plants. Thus when ammonium nitrate has 'been employed as a fertilizer free acid will-be produced. It has also been discovered (by the Russian scientist Prianischnikow) that natural phosphates have a much better action when employed in combination with physiologically acid or neutral fertilizers, than Specification of Letterslatent. Patented Feb. 14, Applicationfiled July 8, 1919.

.mass.

Serial No. 309,501.

when they are used together with physiologically basic fertilizers.

111* the manufacture-of the described fertilizer the proportions of phosphate added to the nitrate of ammonia may be varied within Wide limits. Usually, however, good results will be obtained by using from 2 to 10 parts by weight to each 1 part by weight of phosphate. Y

The best results are attained by using as I addition to this nitrate the more easily decomposable the Gafsa phates can phosphate is a type of mineralphosphates which are of. a comparatively readilydecomposable character. Such phosphates occur, for example, at Gafsa 'in North Africa and are considered to be Ludwig Schucht Die Fabrication des Superphosphates l909 pages 47-49 and 78).

' Example 100 kilograms of Gafsa phosphates were ground to a fine powder, and the powdered product was then mixed with 200 kilograms of nitrate of ammonia.

phosphates such as for instance phosphate but also other phosbe usedwith advantage. afsa of organic origin. (See The mixture is moistened with water and I subjected to granulation. This granulation may be effected by continuously stirring the mixture while heating the same to a tem erature suflicient I claim: '1. A fertilizer consisting of a granulated mixtureof ammonium nitrate and phosphate material. I

'2. A fertilizer consisting of a granulated mixture of ammonium nitrate and phosphate rock.

3. A fertilizer consisting of a granulated mixture of ammonium nitrate and a readily ecomposablephosphate mineral of an organic origin.

4. A process of manufacturing fertilizer, which consists in mixing a phosphate and ammonium nitrate with water and granulating the mixture during evaporation of the moisture. i

to effect the drying o the 1 Intstimony that I claim the foregoing as my 1nvention,-I have signed my name in presence Of.tWO subscribing witnesses.

' BIRGER FJELD Witnesses:

GUNNAR TOMTU, 'MARIE BERo UIsT.

HALVORSEN. 

